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I have purchased some pre hung doors at 30" by 80" the jambs are 4 5/8 wide. The house is 50 years old and the existing door frame is 5 1/4 wide. Any solution as to how to fit these doors into the old frame.

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are they split jam pre-hung doors? – shirlock homes Mar 19 '14 at 21:25

All you need to do is install the door with what is called a "jamb extension". Just get some strips of 5/8"x3/4" inch molding, then glue them to the non-hinge side of the new door jamb. On a painted jamb these will for all intents and purposes disappear with sanding and some wood putty. On a stained jamb you'll be able to see the extension, but you can minimize how much it stands out by picking wood with a similar grain pattern.

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Take off the trim, remove the old frame, install the new frame, re-install trim or install new trim. That, or re-use the existing frame by hanging the new door in it.

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